SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e426899af54f40eedd821206d9be9d234f9abe322fc31692c53f7a20fbe82058' 
  AND token = 'UCO0BR6aU4V/9OwjebJ1r3pSMzUYPek7pI3Gh+HVCKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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