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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c257757a6ba2f3ba86c19580566fc07c2468e1092ade3dd0d6df7e09b85be2c6' 
  AND token = 'ukGqbQhIw99ykAhDdAx31F5yXtXW5aVpJ0uzJavbGcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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