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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd16ffd7a4f8a5c54030cc389cb685e994c29065eb57dcd8c1444d1ffb876ca' 
  AND token = 'jF4a6L+gSAeQdj0qXqJG347RUYodYr5HrmAOKp7ehC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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