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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ca78672089a6afddd586ebc2e05c11e9775e731f2962c46f426a12158b533e' 
  AND token = '6O8glnzrReCfwx9rJhISTUluAMwhwCWCf/u5wTjec9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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