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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71481c0fbc8ccdd9d1eb0660adadffa66b7d81fd7c2aa49503f600cd46dfa57' 
  AND token = 'kkjtr1CI4WsojI67UgLbx6s3q6AiO6FZeAhcBU9VjF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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