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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61c20bd2933736c52f09013d268d5ecd4de31a1d06ed1fc64c7bcacddac5eba' 
  AND token = 'm/m9m40nxM55sW0o+r1cwr6e1TrKRPzJXs5AgPa2Lns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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