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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acaf4190d5b0d295397c174e636c53b9c8ae74231fc49f3de12c0f7caa822b2a' 
  AND token = '36kDKoQeXLGCy44thJzHcCYfnDO7yMDqwzNLBeY9BCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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