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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98fd4a953a6d761ecb6874202791da099caefa5ebd8b7cae4c55ad7a95682627' 
  AND token = 't+8H49F/AxqYlyDls2+MF1jGpm3199Sc6zzMfORjPdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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