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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7ce6a90c60f4ed6acc976475d23f3ef8f3c38650a4a489cea314b0763928bc' 
  AND token = 'LzZDTHq4iu28hO1l6Z+UySROQU0eJxdNgEvwN2SDRHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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