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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '463d931d7325606c782a642118866b43beac91df5f21ab7c6f393ac10086b112' 
  AND token = 'lNzPGmOn1OnBFsUriB6L8JpEwnzGo+Vpz8016rKDLHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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