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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5839e976313f844c75237044fd580ce61e8b36aea4214f26996bb4a621a53fed' 
  AND token = '9KMPmIc38cWN9oPvxn102RXfi5tBXmgkIV73z3Z3WlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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