SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2af8d3238b4ad167fe207fc32604de3c4afd9f975219b47785b8dd1b9666fc2' 
  AND token = 'zcbHEOURN4gC0fDKakoxWWzUBhZ93kQYulnbQqJam6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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