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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edb38c699e27a361a9685e82a51cb63987a13ebffe301a2713845b3f3ee436e' 
  AND token = '1ywCU6HXc5CQ+QtHIpmqSsn8YSZVh9nFUvq2wlaO8EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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