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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '780e9464b5a15f3269c57d759ca6d64ecfd4e86946480284f94f8c5c1ed08e18' 
  AND token = 'lK4Jc1K7reydIFN3AhnZD8Qf798FivQqyI6HtEuxsBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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