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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec116ef4d5f29f3b978c6e542ce684c548524c0f9a1cbf70f101beb745de7f1' 
  AND token = 'KY12YC9hjDvsi766+UmFiWu4aTDg9xI/B/XTcZH9TUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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