SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2886561754e9590c9c212dbb79889776e36d0dc37b616374703189155357747' 
  AND token = 'xp/DbwuQ/ix+HKbTMvAEGYrfRCgdbFS3GaVCphEyuPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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