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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc829fc8ac65a9bf9cdd468e2b9743baed8926795843703dac2cb6a73aa5481' 
  AND token = '4j03OQuhQ/uNJ82aowev3K1p4COH96oODKe48U5U4cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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