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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc8cceeb17e7d2368c504f662f16fe5d5eed2fdf466d7bd1740356ec2edcb34' 
  AND token = 'EQc1d4chSiIRQFxOlszTqHsnuTvNb+e6k6gQy2EsU4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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