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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4992db27a4c26c649afe95af47432d590d018786d0b872ffbcb29b62090b1939' 
  AND token = '1koa3jopJ5VyzEX+yfkKDwCiYSl6S+pbWzoG867Opr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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