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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67d468df23daee4600101a186e8f974e5e94f9a8672ee922bd880019b5d854b' 
  AND token = '/d2THW8hfQ7+gwNsc1qqEkiwSANsKKT691koqIzEedM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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