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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6932c2a0328b4d48745293d81352fe469cb81d469dfc13a47666a0facfff0633' 
  AND token = '2JCDHsIizMEC8ge01Iid6ADuInbuQnHod1A5/QzZox8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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