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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db1805bdd2e7d43bc5a88d5062813be08c64f5096b01258cbf225843de85933' 
  AND token = 'bF/oGfq2wW8e3ZehFx9D+oPzbag5ZGwxmJLw4Z6u12M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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