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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4077b82444c74585e2d12914985d1c681e93ccac2894c32524d8fd0bafc0631' 
  AND token = 'FvsJT1mAcFbxZo4GNBUwJxfuQNNPfAZ6RsvcH/nclB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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