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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d3e4198938a45222370ea3c566090cd2624c4c8c15c7a98c5214e0bdfdd2e5' 
  AND token = 'n33UGDgX9IA7InsUfCht/sdRv9j0FEcfNXvrtV7fvYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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