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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dde80a9c4cc96a7de239fb682f28eb86e7563a1834c9a26c2113791a140740' 
  AND token = 'a/Z434dsN7DJPwbMBGpY4XtE8gSr97/uTAOC/VOEEnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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