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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd860fd1d8192bb24eb3fbfae0db1204887b20dc055711a19c03f1f972726dad' 
  AND token = 'N5A/iOlQrrGqdVPwVS7d3y6pMRkBkPxOb1tJHJiKkdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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