SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e71f66894128ef51cf73038ea640847a262709b37d1d20f8ca9c77d364d2d2' 
  AND token = '//uVg4nyFhwmWKO1U5q7aDSAdkapxG7gmxqcHNFJYts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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