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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000f84d144ad62cacfe66676036713c93570eecd3fb10f60debddf80d1716940' 
  AND token = '0njxSIisz3E+c/ox/omwctgJeq7oo4AqoIkGTRzEz2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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