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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1e661c6fc9128bc480270aaa3aa8fe11baaf8655408273901c9b67eee752d5' 
  AND token = 'J1I6kRmIzcWJ4m+A1oidaJT7SbApJF1VO1X6o6VsSIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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