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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd56616fe05b022b0efb67100a0a89703a931aaaf6392839672b5a1602e8553f3' 
  AND token = 'DqXX37MKyF9LAm4xyRcx9Rj7JYi8tm0mIwJS1GyAMVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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