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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71ea552acc265cc1f0da9db0bc1bf6e7da9f68343d6288745d706375e192cd1' 
  AND token = 'lRC+22pUaTjw2gizrNg8reZSeNffi10iX41Ae4w1SgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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