SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b2803771d5d6a510b26d2666bd77ac3a4cc488830d3972dec44b129a9f31e7' 
  AND token = 'lO5ivZHo5zhJecflgO7rjnzlxKHXpjZSuGG3mrOIvQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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