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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4673b37e539f7fa6ca54a7f7dd3a0a142753fb761faf8f9f0a275b8d68e489d1' 
  AND token = 'DjFcyoegoDDrSJ2fwlhEzAwsf52Q64V/FSv1T0zj3Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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