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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336e297aaa590d359ff0f9566a557f32674fe4f477bc3eaa101cfc1a362d78a1' 
  AND token = '2PBOx2Z/NJUooTS2T+9Ib6A5EIObLt5gVBpC9nwha/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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