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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5834a2b5a79c19f484cb5968a9a28cef40ba1a149bb859a76643b8773923b37' 
  AND token = 'rb9G/OjceHFNTtheRHl+/5iDEr8RKA7xVvYtb9HKUqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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