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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82031df861640823fb5d81ebff66c0b7f8f9f7913162406b4960906da248b30' 
  AND token = 'ZJsyadlU3MUcuqe1V3sIhDcuJ/n7UaQqzVHTod7buqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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