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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ff9bdbc81ba153be53a8e39d5deb39994eca3c7ca8e29bf23c62eca895b5cb4' 
  AND token = 'XijeIG92/kyDNpKzd9OrG9gCP0A9CEbojbNUTtdvAzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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