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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a31ebd5157f0d1e21acf5a6e5991fc2b64e1e9c46397dfc8594a3120a25f89' 
  AND token = '/j44imxR41MdY0j4FdEKhFFnjHk40UiSIovvaU6eNXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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