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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaef3db1ff8f6a6d8e8fc17bf67bf2151e9bcbc418c4e3a24df1e97cbc670af1' 
  AND token = 'sAKuZz8OTi6bHB2JHMq2327ma8zu82UJ+XASJmfUwPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}