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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe9209fa1265563d2dcb22e7197a65eef367a1ec6db96f45a54de46632dfecd' 
  AND token = '2KuNtTeOo2hnzBLP/FOV5Q6j6t7CwesdZBzyt6PXjSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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