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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9bbf5103f88e84213feaa2c57cecf85bcc34603d90ce5b7c489a99850db197d' 
  AND token = 'KutO9Oo//0q3+LqezP1ibKNd9UmQ9o77L2GFya11QG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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