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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd399f4de04a266a3493e089c79a009130d62fca81f85bda28209646998d04b6f' 
  AND token = 'ZeFomejpLUSFFSmklBwTY6sMXLNvHkROuenHz45oWN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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