SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bfba56dc40ddefdeb2bdceb79cfeee97f5a9a2fceaf618cd6f94980ec00a63' 
  AND token = 'p119F0d+Q4XC3aGPGUpBtCApBul/ji3Uq+pPApXs93w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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