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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29af7002d03a20ae3c09a48fdb6a30d76ae4556ae3add84bc6b6417d2476650c' 
  AND token = 'HY7XDfqJibswyULjI6Ow9Z1PMQYidWpIQIcIk6LPHAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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