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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cb6e0eaf3eb212593d1489f4a5956a256cc7924dd07f3ec4cce40c49cc7ce9' 
  AND token = 'j3UUsW7jT2qsPmdkomtpWyCP91OsIGndlLgMZoYp0VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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