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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a80f0df62aab55050cc579841df69c4f7a412ae3e99d0b1385c9ec07aa0419' 
  AND token = '5Jrq/tkMHuNve1ztHQ2JboCaui2jWsrGDsKRel0j6NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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