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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be96a6dc9b4c849496839dc0ecd3ca5d343838428a70da045d2b8aecabf8f3b' 
  AND token = 'FK/9EHvpWcDpSiN5nAKGoGhq08HUNbi0Dsp+xdRMrBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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