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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487f1c9d7edbbd592559a9503c62220e8e57112e0688cd251db2bb3efb9d4623' 
  AND token = 'sbGyIvhn3kYQpWbj/X/TIKas1zQXl1hbb6zcDDIxtWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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