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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b3c79364675edad55e887281e7dd07aa2d50953a14b1e976f428132a03b67b' 
  AND token = 'GNe5WMW2H9iJIIN7gvsSK0xBpZUWB7tw2el6XoY+Zh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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