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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf57925f705c2c7edb7fe9beca27544553f6c0ab91de784e086e6867af4e6b4' 
  AND token = 'vR+HPzoS6zDdqwT0gsif8LkK8HegEwC1djnltbIzRHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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