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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b4259c3d8672d4bc16e9890b7eb0f7c478f74851013ff6ff7d70fdd2ce73b9' 
  AND token = 'Twqj4AqByCMupUo1BxEG3EjONQ0e5z9mIbbkDKdgNvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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