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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a85179b285298f51d262988fc116af1f0291712990e39c3ee82637e806bd2a50' 
  AND token = 'faN7nYszAMEjUsVbx/fwBguPMK/iJkoOvk02K3WdRNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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