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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b650a31955c00a327ec8ccb28b372889989a878492d6091302c2170a7b6a3cda' 
  AND token = 'JTFmgUgpN2zT0sYrFA4A0A34wWU98eRJ/lIVJl1QeN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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