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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeab2e0cc7b19ad9905b052fdecd95fb96cfa41938252e33a88e956cf4f70691' 
  AND token = 'cR64ZSgORBrt0Za71mU6fIj2GH8xjVLldgTxe1ad6Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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