Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c1ba7d6023da69a3129c2b409460d8a08812fddfd6353573a17f0e12ca5b88' 
  AND token = 'b6rrmlfIKaRjaFrCJaWPwo8gSpLN/mJJoA3jfIuQG+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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