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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe76fe105ece7191985b789bd690a098639ea3e7636b0e4738a82c12dcc3fab' 
  AND token = 'fGdRj6aDZ44dTaAgM5tuqwLf/Djyn2YYpYef9laQ7co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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