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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c462307cc9fe5bfae768bf33c0d8a2f18039b87b43a176dcb952b5d3e0ca8ae3' 
  AND token = '0kkIziM6LCIQJZsPTosMhXG952v7bOZ/sbiDBSqWe+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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