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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd28c3bd5f696261ff30058ba06d64173506a808180e788a3a946a98a95e18b5' 
  AND token = 'TXVg8gRnx0Xd0oGAk1hWwUl/6qFYFTY6CIm9sA0fl48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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