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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd575a644ce75f809fd05af8e906f08dace958216e1736bc2e5f63ae6e73f67' 
  AND token = '4YI/R5HrUf1wJACyDbdWqkMFwbUIs+Tf5171RDEwvAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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