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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792118dc9855110d8c2305eb3778c535c73800c3ad851290ad94cc4fa41ff79c' 
  AND token = 'H+KZ/WDY/wepotf6FFXvycLvUS01wiLkW0ome0LA9lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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