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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6032bac9a6ec708d672e249af9b86b0e7b46b35a6cb5f8c826ba44bf099f49cc' 
  AND token = 'nN/rJ3pU/tc+xviBC6B7wpxIEwUhSar4YoqFLK9C9lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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