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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cf59a09b7900bfbd3c7f5d32e53813c51837bb142650186236ebfc6d6d5c27' 
  AND token = 'dgo+kYi1Hg9QQqTp00OZYayjJGpTo7dNpLi8TtVsHcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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