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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c47f80a4b94b53eeecae76c9dffb778451bddbb554f8b5697c71b8c76f8ad0' 
  AND token = 'V50Fo2tBBc5oJqOSLp0A5Ncb+uEWP0uEi9JOwHwCWFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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