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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cce2f2a402d0ee4a2fb5c860febe362232d168ce618444d474ba64a311bf88b' 
  AND token = 'mOec4xnLqs/qOwCp5hxAal0Zh47q7AmAgT+VDWRuB0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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