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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769a0a6f26f2dd56f7c9f4c55ec3e0b0c3f25f6159701a5749338890866bb8d4' 
  AND token = 'J6SVSFoER2pxilfP1Js6luVG2NeuvSaPbjlfFMdoucI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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