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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f55f138c2af9e420f2ee0d9e5ab1175bb6650474a76e00dcad6e227d0f401e' 
  AND token = '1zmlX5zduQbiPImzEFfg3PFTCo2uRqaJtr0zJKzDAG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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