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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f293e4cadd777b3c29cc399aa62b8ea25725c85aa28a65a403b84255066f93f' 
  AND token = '3Fusyb3rmACXu3p69SX6eXvZ0ZtiDsZQQxBzwYLirk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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