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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feef2bf09b9f4e8e621e0d073f5e810f8f8bb2a794aa26ec044abee2629cb4e5' 
  AND token = '+/lRFf4MCKdifJIOnrPNqirxr10N38sd5f+leaA3UHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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